How many different heart sounds are there?
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How many different heart sounds are there?
In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub. ‘ The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the heart function. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds.
What are additional heart sounds?
Extra Heart Sounds These include ejection sounds that occur with pulmonic or AS heard in early systole, “clicks” that are heard in mitral or tricuspid valve prolapse occurring later in systole, as well as “snaps,” “knocks” and “plops.”
Where are S1 and S2 heart sounds?
Normally, S1 is louder than S2 at the apex, and softer than S2 at the base of the heart. Pathologic changes in the intensity of S1 relative to S2 may be seen in certain disease states.
Where is the S2 heart sound heard?
Exam Technique in Second Heart Sounds Splitting best heard in the 2nd left intercostal space, close to the sternal border. Second heart sounds are best heard when patients are semi-recumbent (30-40 degrees upright) and in quiet inspiration.
Where are the S1 and S2 heart sounds heard?
Listen for normal heart sounds: The 1st heart sound, S1 (lub), marks the beginning of systole (end of systole). Related to the closure of the mitral and tricuspid valves. Loudest at the apex….1. Auscultate the heart at various sites.
| S1 | S2 |
|---|---|
| Just precedes carotid pulse | Follows carotid pulse |
| Louder at apex | Louder at base |
When do you hear S3?
The third heart sound (S3), also known as the “ventricular gallop,” occurs just after S2 when the mitral valve opens, allowing passive filling of the left ventricle.
What is the S2 heart sound?
The second heart sound (S2) represents closure of the semilunar (aortic and pulmonary) valves (point d). S2 is normally split because the aortic valve (A2) closes before the pulmonary valve (P2).
When is S2 heart sound heard?
S2 is produced in part by hemodynamic events immediately following closure of the aortic and pulmonic valves. The vibrations of the second heart sound occur at the end of ventricular contraction and identify the onset of ventricular diastole and the end of mechanical systole.
Where is S2 heart sound best heard?